The Last Score — Ellery Queen

A tough-guy travel agent loses an heiress while on a drug-fueled vacation

Reid Rance can't take his eyes off May Gibson. It's not her figure or her face that's got him mesmerized though. It's the emerald on her finger and the checkbook in her hand. She looks like money, and he'll do anything to get it -- anything short of taking her daughter on a Mexican vacation. Reid is a very special kind of travel agent who makes a living taking soft men on dangerous trips. Leslie Gibson is the savviest teenager in town, and she's intent on getting her kicks south of the border. May hires Rance to babysit her, but he's the one who'll need taking care of.
 
Leslie is desperate to sample all that Mexico has to offer, from sun-soaked beaches to the drug-crazed underworld. When she's kidnapped by a cartel, Rance must find her quick -- or he'll never escape Mexico alive.